import re

lic = ['admin', '123456']


def strMatch(Rules, String):
    return re.match(Rules, String).group()


st = input("请输入账号：")
Ru = r'[0-9a-z-A-Z]'
st1 = strMatch(Ru, st)
if st1 in lic[1]:
    print("账号已存在--")
else:
    print("账号不存在")